Minus Mission - Game from Math Game Time: Minus Mission is a free math game providing practice in subtraction in a creeping slime theme. Large green slime at the top of the screen drips blobs with subtraction problems toward a robot at the bottom. Kids must fire at the slime with the correct answer.

Questions answered by this video:

How do you subtract negative numbers on a number line?

Why is subtracting a negative the same as adding?

Staff Review:

This lesson explains subtraction of positive and negative numbers using a number line. It also describes each problem in two different ways. A nice way to understand operations with integers on a number line.